Attachment for dental lathes.



W. F. RICHARDS.

ATTACHMENT FOR DENTAL LATHES.

APPLICATION FILED OUT. 25, 1911.

1,032,241 Patented July 9, 1912.

'12 .m-mm u El 1400 *Wfoz am MW.

WALTER r. Marianne; or QUINCY, ILLINOIS.

ATTACHMENT FOR DENTAL LATHES.

Specification of Letters Patent.

Patented July 9, 1912.

Application filed. October 25, 1911. Serial No. 656,780.

of Illinois, have made a certain new and useful Invention 1n Attachmentsfor Dental Lathes; and I declare the following to be a full, clear, andexact description of the same, such as will enable others skilled in theart to which it appcrtains to make and use the invention, referencebeing had to the accompanying drawings, and to letters or figures ofreference marked thereon, which form a part of this specification.

Figure l is a side view of the invention. Fig. 2 is a plan View of thesame. Fig. 3 is a cross section of the eccentric and its ratchet. Fig. 4is a detail longitudinal section of the chuck member to which the socentric is connected.

The invention has relation to attachments for dental lathes, and itconsists in the novel construction and combinations of parts, ashereinafter set forth.

In the accompanying drawings, illustrating the invention, the numeral 1designates a bed plate adapted to be secured to the lathe stand andcarrying a standard 2 having a base 3 adapted for detachable connectionto the bed plate, preferably by means of a hook-pin 4: at one end of thebed plate, slidably engaging a seat 5 of said base, and a pivoted bolt 6at the other end of the bed plate removably engaging an open-end slot 7of said base, said bolt having preferably a screw head 8 engaging a camsurface 9 of the base, for making a rigid connection.

Working in a slideway 10 in the upper end of thestandard is areciprocatory bar 11 having at one end a seat 12 for a shank or tang 12of a removable file 13, said bar having at its opposite end a pivotalconnection 13 with an eccentric 14 of a power shaft 15. The power shaftis upon rotation in one direction adapted to grip and turn the eccentricto reciprocate the bar and its file, and upon rotation in the oppositedirection to turn freely in the eccentric and convey no movementthereto, preferably by means of a ring 15, fast thereupon and havingopposite circumferential notches 16, 16 of .gradually increasing depthto a shoulder 17 at the end of each notch, and a springacting yieldablepin 18, seated in the eccentric and bearing against either of theshoulders to rotate the eccentric, said pin upon reverse rotation of thepower shaft being I pressed outwardly in its seat by the beveled wallsof the notches.

In practice the ring 15 is engaged by the chuck screw of the lathe.

The file 13 is secured in its seat in the movable bar by means of athumb-screw 19.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. An attachment for dental lathes, comprising a bed plate adapted to besecured to the lathe stand, astandard having means of detachableconnection with said bed plate, a slideway at the upper end of saidstandard, a reciprocatory bar working in said slideway, an eccentricstrap having a pivotal connection with said bar, an eccentric disk, anannulus engaging said eccentric disk having an aperture adapted forengagement by the chuck screw of the lathe, and means of connectionbetween said annulus and the eccentric disk whereby said disk is turnedby rotation of the ring in one direction only.

2. An attachment for dental lathes, comprising a bed plate adapted to besecured to the lathe stand, a standard having a base, a detachableconnection for said base and the bed plate comprising a hook-pin at oneend of the bed plate slidably engaging a seat in said base, and apivoted latch at the opposite end of said bed plate having engagementwith an open-end slot of said base, a slideway at the upper end of thestandard, a reciprocatory bar working in said slideway, an eccentricstrap having a pivotal connection with said bar, an eccentric disk, anannulus engaging said disk having an aperture adapted for engagement bythe chuck screw of the lathe, said annulus having oppositecircumferential grooves of gradually increasing depth and a shoulder atone end of each groove, and a yieldable pin carried by the eccentricdisk and having engagement with said grooves.

3. An attachment for dentallathes, comprising a bed plate adapted to besecured to the lathe stand, a standard having a base, a detachableconnection for said base and the bed plate comprising a hook-pin at oneend of the bed plate slidably engaging a seat in said base, and apivoted latch at the opposite end of said bed plate having engagementwith an open-end slot of said base, a slideway at the upper end of thestandard, a reciprocatory bar working in said slideway, an eccentricstrap having a pivotal connection with .said bar, an eccentric disk, anannulus engaging said disk 5 havin an aperture adapted for engagement ythe chuck screw of the lathe, said annulus having oppositecircumferential grooves of gradually increasing depth and a shoulder atone end of each groove, a 10 yieldable pin carried by the eccentric diskand having engagement with said grooves and a detachable file having aseat in the end of said bar, said file having a lower triangular pointedfile-cut surface and guard- WVALTER F. RICHARDS.

Witnesses LYMAN MOOARL, KIRK SnAweo.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

